[qooleot]

I think NPM 3 is adding flattening. I.e. if A and B both are alright with 1.0.2 of C, then it'll not duplicate it under A and B.

[Nitramp]

Flattening identical versions reduces the size/expense, but it doesn't really help if all libraries have slightly differently versioned dependencies. That is common, in particular if people depend on exact versions.